Discussion
Water can be used as the fire extinguisher if the fire involves:
Answer: A
Water can be used as a fire extinguisher if the fire involves ordinary combustibles such as wood and paper, which are class A fires. Water cools the burning material below its ignition temperature and soaks it.
It must not be used on electrical equipment, since water conducts electricity and can give a shock, nor on burning flammable liquids, which float on water and spread the fire, nor on flammable gases, which are not put out by cooling. So the first option is correct.
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